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Chapter 5.2 Genetics Since Mendel. When offspring of 2 homozygous plants show an intermediate phenotype examples: 1)red flower mated with a white flower and produces a pink flower 2) sickle cell. 1. Incomplete dominance. 2. Multiple alleles.

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Chapter 5.2

Genetics Since Mendel


1. Incomplete dominance


2. Multiple alleles phenotype

  • A trait controlled by more than 2 alleles

  • traits controlled by multiple alleles will produce more than 3 phenotypes

  • Examples: blood type

    • 3 possible blood types A, B, and O

    • O is recessive to A and B

    • if you have both an A and B you show expressions of each allele called AB

    • if you have “A” type you are either AA or AO(same for B, it’s BB or BO)

    • If you have O blood you can only have OO


3. Polygenic inheritance


4. Environmental Impact trait

  • 2 types:

  • - internal- chemical dominance

  • - male birds brighter than

  • females

  • - external- environment change

  • - exposure to sun results in

  • skin cancer

  • - taking precautions vs. not

  • - smoking

  • - alcohol


5. Recessive Genetic Disorders


6. Cystic Fibrosis allele holds a disorder.

  • Recessive genetic disorder

  • common in Caucasian Americans

  • can lead to death

  • occurs when a thick fluid lines the lungs and intestinal tract making it hard to breathe

  • results in bacterial growth and respiratory infections


7 allele holds a disorder.. sex-linked disorders

  • Occurs in meiosis (sex cell reproduction)

  • more common in males because males only have one x that needs to be recessive

  • example: 1. color blindness

    • On x allele

    • recessive disorder

    • 2. Calico cats

    • - On x chromosome


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